I have tried to get a Silverlight web part to work in SharePoint, but each time I add the web part to the page, I get the SharePoint error message. Here's the tutorial I just followed: http://blogs.msdn.com/andreww/archive/2009/03/12/silverlight-web-part-in-sharepoint.aspx
The only thing I think I'm missing is System.Web.Silverlight in the GAC, but I can't for the life of me figure out how to do that. When I try to add it using .NET Configuration 1.1, I get an error messge that says: Unable to add the selected assembly. The assembly must have a strong name (name, version, and public key).
I'm running Windows Server 2003 on a Virtual Machine.